Migration and the UK's Changing Population Geography

Migration also heavily influences national birth rates. The Total Fertility Rate (TFR) in England and Wales dropped to an average of 1.55 by 2021. However, the TFR for non-UK-born women is significantly higher (2.03) compared to UK-born women (1.54). In fact, 28.8% of all live births in 2021 were to non-UK-born women, showing how migration indirectly supports natural increase.

How Migration Alters Population Geography

You can easily spot the difference between a densely packed city high street and a quiet coastal village, but the invisible age differences between them are just as drastic. These regional disparities are driven by internal and international migration patterns.

The UK is split between the densely populated Urban Core (like London, with 5,500 people per km²) and the sparsely populated Rural Periphery (like Scotland, averaging 68 people per km²). A powerful multiplier effect occurs in urban cores: international migrants settle there, sparking business growth, which creates more jobs, which in turn attracts even more migrants.

Meanwhile, internal migration reshapes the country in three ways:

• North-to-South Drift: Since the 1960s, over 3 million people have moved from northern industrial towns to the South, pushed by deindustrialisation and pulled by quaternary jobs.
• Rural-to-Urban Migration: Young adults frequently leave rural areas (e.g., Central Wales) due to a lack of career opportunities in primary industries.
• Counter-urbanisation and Retirement Migration: Older individuals often move out of cities to rural or coastal areas (like Dorset or Cornwall) seeking a better lifestyle.

These movements radically alter the demographic age structure of regions. Migrants are predominantly young and economically active (working age, 16–64). For example, 80% of post-2004 Eastern European migrants were aged 18–34. This makes urban centers youthful (London's average age is 34) but leaves rural peripheries with an ageing population (the South West's average age is 42.9).

Calculating Dependency

Geographers measure the economic pressure on a working population using the dependency ratio. It compares the economically active population against the dependent groups (children aged 0–15 and the elderly aged 65+).

• Urban Cores have low dependency ratios because they attract young workers. For example, Tower Hamlets in London saw a massive 22.1% population increase since 2011. It has the lowest proportion of elderly residents in the UK (just 5.6%) and a huge working-age base (71%), yielding a very low dependency ratio of 40.8. This high density creates pressure on school places and housing.
• Rural Peripheries have high dependency ratios. North Norfolk has a median age of 54, with one in three people (33.4%) aged 65+. Its dependency ratio is a massive 88.3. This creates distinct service pressures: out-migration of young families causes village schools to close, while demand for specialist geriatric care skyrockets.

Worked Example

A geographer is analyzing the demographic structure of an industrial town. The town has a total population of 150,000. Census data shows that 27,000 residents are aged 0–15, and 33,000 are aged 65 and over. Calculate the dependency ratio for the town.

Step 1: Calculate the percentage of dependents.

• Total dependents = $27{,}000 + 33{,}000 = 60{,}000$
• Dependent percentage = $(60{,}000 \div 150{,}000) \times 100 = 40\%$

Step 2: Calculate the percentage of the working-age population (16–64).

• Economically active = $100\% - 40\% = 60\%$

Step 3: Substitute into the dependency ratio formula.

• $\text{Dependency Ratio} = (40 \div 60) \times 100$

Step 4: State the final answer.

• $\text{Dependency Ratio} = 66.7$

The Impact of Immigration Policy on Diversity

Why does a modern British high street feature everything from Polish supermarkets to South Asian restaurants? The answer lies in decades of shifting immigration policy, which has transformed the UK's cultural landscape and fostered multiculturalism. Between 2011 and 2021, the proportion of the population identifying as an ethnic minority rose from 14% to 18.3%, while the White British population fell from 86% to 74.4%.

Three major historical eras of policy have driven this diversity:

• Post-War Commonwealth Migration (1948–1960s): The 1948 British Nationality Act actively encouraged citizens from the Commonwealth to migrate and fill severe post-war labor shortages. By 1971, over 1 million people (including the Windrush Generation) had migrated from India, Pakistan, and the Caribbean, forming distinct ethnic enclaves in industrial hubs like Southall and Bradford.
• EU Freedom of Movement (1992–2020): Following the 1992 Maastricht Treaty and the 2004 Accession of Eastern European nations (the A8), the UK saw a massive influx of migrants. In agricultural hubs like Boston, Lincolnshire, between 10.6% and 13% of the population originated from EU accession countries.
• Post-Brexit Points-Based System (2021–Present): Free movement ended, replaced by a system awarding points for skills, English proficiency, and salary thresholds (ranging from roughly £25,600 to £38,700).

These movements have sparked qualitative cultural shifts. In the West Midlands, the "Desi Pub" phenomenon (such as The Red Lion in West Bromwich) has seen South Asian landlords save struggling traditional British pubs by combining them with Punjabi food and Bhangra music. Similarly, post-2021, global festivals like Eid in the Square (London) and Lunar New Year (Manchester) have surged in popularity, while retail diversity has expanded into specialized hubs like Cardiff's "Little Italy".

When evaluating why the UK is so diverse, it is vital to balance policy against economic drivers. While immigration policy provides the legal pathway, the true magnet is the economic pull factor (such as the need for agricultural workers or NHS staff). Furthermore, when discussing migration, one must distinguish between an economic migrant (who moves voluntarily for better pay) and a refugee (who does not move for financial gain, but rather has legal protection after fleeing persecution).